Results 101 to 110 of about 205,774 (262)

Confronting expansion distances of planetary nebulae with Gaia DR2 measurements

, 2019
Individual distances to planetary nebulae are of the utmost relevance for our understanding of post-asymptotic giant-branch evolution because they allow a precise determination of stellar and nebular properties.
Schönberner, D., Steffen, M.
core   +1 more source

Abell 48 – a rare WN-type central star of a planetary nebula [PDF]

, 2013
A considerable fraction of the central stars of planetary nebulae (CSPNe) are hydrogendeficient. Almost all of these H-deficient central stars (CSs) display spectra with strong carbon and helium lines.
H. Todt, A. Kniazev, V. Gvaramadze, V. Gvaramadze, W. Hamann, D. Buckley, L. Crause, S. Crawford, A. Gulbis, C. Hettlage, E. Hooper, T. Husser, P. Kotze, N. Loaring, K. Nordsieck, D. O'Donoghue, T. Pickering, S. Potter, E. Romero-Colmenero, Petri Väisänen, Travis J. Williams, M. Wolf   +21 more
semanticscholar   +1 more source

New Arabic Records From Cairo on Supernovae 1181 and 1006

Astronomische Nachrichten, Volume 346, Issue 9, November 2025.
ABSTRACT The remnant of the historical supernova SN 1181 is under discussion: While the previously suggested G130.7+3.1 (3C58) appears too old (3000–5000 year), the unusual star IRAS00500+6713 with a surrounding nebula (Pa‐30) has an expansion age not inconsistent with a SN Iax explosion in ad 1181 under the assumption that neither acceleration nor ...
J. G. Fischer, H. Halm, R. Neuhäuser, D. L. Neuhäuser   +3 more
wiley   +1 more source

Investigating potential planetary nebula/cluster pairs [PDF]

, 2013
Context. Fundamental parameters characterizing the end-state of intermediate-mass stars may be constrained by discovering planetary nebulae (PNe) in open clusters (OCs).
C. M. Bidin, D. Majaess, C. Bonatto, F. Mauro, D. Turner, D. Geisler, A. Chené, A. Gormaz-Matamala, J. Borissova, R. Kurtev, D. Minniti, G. Carraro, W. Gieren   +12 more
semanticscholar   +1 more source

Accretion and Differentiation of Vesta and the Mesosiderite Parent Body Inferred From Ni Stable Isotope Compositions

Geophysical Research Letters, Volume 52, Issue 19, 16 October 2025.
Abstract We present high‐precision Ni stable isotope data for mesosiderites, eucrites, and diogenites to investigate the accretion and differentiation of asteroid 4 Vesta. Ni isotope variations in eucrites and diogenites are dominated by kinetic diffusion and chondritic contamination, rendering them unsuitable for reconstructing Vesta's primitive Ni ...
Ke Zhu, Makiko K. Haba, Qi Chen, Lu Chen
wiley   +1 more source

Role of Magma Oceans in Controlling Carbon and Oxygen of Sub-Neptune Atmospheres

The Astrophysical Journal
Most exoplanets with a few Earth radii are more inflated than bare-rock planets with the same mass, indicating a substantial volatile amount. Neither the origin of the volatiles nor the planet’s bulk composition can be constrained from the mass–radius ...
Chanoul Seo, Yuichi Ito, Yuka Fujii
doaj   +1 more source

The Spatial and Emission Properties of the Large [O iii] Emission Nebula Near M31

The Astrophysical Journal, 2023
Drechsler et al. reported the unexpected discovery of a 1.°5 long [O iii ] emission nebula 1.°2 southeast of the M31 nucleus. Here we present additional images of this large emission arc, called the Strottner–Drechsler–Sainty Object (SDSO), along with ...
Robert A. Fesen, Stefan Kimeswenger, J. Michael Shull, Marcel Drechsler, Xavier Strottner, Yann Sainty, Bray Falls, Christophe Vergnes, Nicolas Martino, Sean Walker, Justin Rupert   +10 more
doaj   +1 more source

Photoionization modeling of the Galactic planetary nebulae Abell 39 and NGC 7027

, 2011
We estimate distances to the spherical planetary nebula Abell 39 and the bipolar planetary nebula NGC 7027 by interpolating from a wide grid of photoionization models using the 3-D code, MOCASSIN.
Ashkbiz Danehkar, Bernard Salas, David J. Frew, Orsola De Marco, Quentin A. Parker, Rauch, Zhang   +6 more
core   +1 more source

Current understanding of electroautotrophy and its relevance in astrobiology‐related research

mLife, Volume 4, Issue 5, Page 473-493, October 2025.
Abstract Electroautotrophy—the use of extracellular electrons as the primary energy source for autotrophic metabolism—remains understudied compared to photoautotrophy and chemoautotrophy. Its occurrence in deep‐earth and deep‐sea environments suggests profound implications for astrobiology, yet electroautotrophic microorganisms remain poorly explored ...
Quansheng Wang, Maggie C. Y. Lau Vetter
wiley   +1 more source

JWST Observations of the Ring Nebula (NGC 6720). III. A Dusty Disk around Its Central Star

The Astrophysical Journal
The planetary nebula NGC 6720, also known as the “Ring Nebula,” is one of the most iconic examples of nearby planetary nebulae whose morphologies present a challenge to our theoretical understanding of the processes that govern the deaths of most stars ...
Raghvendra Sahai, Griet Van de Steene, Peter A. M. van Hoof, Albert Zijlstra, Kevin Volk, Harriet L. Dinerstein, Michael J. Barlow, Els Peeters, Arturo Manchado, Mikako Matsuura, Jan Cami, Nick L. J. Cox, Isabel Aleman, Jeronimo Bernard-Salas, Nicholas Clark, Kay Justtanont, Kyle F. Kaplan, Patrick J. Kavanagh, Roger Wesson   +18 more
doaj   +1 more source